> ## Documentation Index
> Fetch the complete documentation index at: https://doc.featherhq.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Attach a verified contact to an end user



## OpenAPI

````yaml /api-reference/openapi.json post /v1/identity/end-users/{end_user_id}/contacts
openapi: 3.1.0
info:
  title: Feather API
  description: >-
    Unified customer experience platform API. Manages identity, conversations,
    memory, agents, procedures, policies, model routing, knowledge bases,
    integrations, and runtime execution.
  version: 1.21.0
servers:
  - url: https://api-sandbox.featherhq.com
    description: Sandbox
  - url: http://localhost:8000
    description: Local dev
security: []
paths:
  /v1/identity/end-users/{end_user_id}/contacts:
    post:
      tags:
        - identity
      summary: Attach a verified contact to an end user
      operationId: addContact
      parameters:
        - name: end_user_id
          in: path
          required: true
          schema:
            type: string
            format: uuid
            title: End User Id
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AddContactRequest'
      responses:
        '201':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ContactResponse'
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Authentication required
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
      security:
        - APIKeyHeader: []
components:
  schemas:
    AddContactRequest:
      properties:
        channel:
          type: string
          title: Channel
        value:
          type: string
          title: Value
      type: object
      required:
        - channel
        - value
      title: AddContactRequest
      description: >-
        Add a verified contact (e.g. promote a claim to a verified contact).


        The channel + raw value together determine type and normalization. For

        typed channels (email, phone, sms, voice, whatsapp, slack, twitter,
        etc.)

        this produces a Contact with the matching type.
    ContactResponse:
      properties:
        uid:
          type: string
          title: Uid
        channel:
          type: string
          title: Channel
        type:
          anyOf:
            - type: string
            - type: 'null'
          title: Type
        raw_value:
          type: string
          title: Raw Value
        normalized_value:
          type: string
          title: Normalized Value
        verification_method:
          anyOf:
            - type: string
            - type: 'null'
          title: Verification Method
      type: object
      required:
        - uid
        - channel
        - raw_value
        - normalized_value
      title: ContactResponse
    ErrorResponse:
      properties:
        error:
          type: string
          title: Error
        message:
          type: string
          title: Message
      type: object
      required:
        - error
        - message
      title: ErrorResponse
      description: Standard error response returned by all API error handlers.
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError
  securitySchemes:
    APIKeyHeader:
      type: apiKey
      in: header
      name: x-api-key

````